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LM25116有低频噪声 已排除工频噪声引起的

Other Parts Discussed in Thread: LM5117, LM25116

输出脚有个特别大的50Hz左右的噪声 排出工频噪声 因为用电池供电也会有这个问题

这个小尖峰应该是正常的开关噪声(频率在50Khz这样 是芯片的开关频率)

观察高边mos管的G极就有一个特别大的上下过冲

电路是webench设计的 宽电压7到33v转5v 输出12A 电路图见附件